For anyone having this issue, post it on their Facebook pages..
Its been 4 months since I purchased my mate 9 and haven't been able to use their apps. Others have not been able to use for over 6 months.
I saw one post and the response was that it is just a momentary issue. What rubbish!! 6 months is not a momentary issue!!
Please, if everyone who has a Huawei and is unable to open the Barclays and Barclaycard apps posts then they will have to do something.
The link to their page is
https://www.facebook.com/BarclaysUK/